Malicious PDF — malware analysis report

Static analysis result for SHA-256 164178b6342430b7…

MALICIOUS

PDF

87.9 KB Created: 2021-03-27 23:20:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 27bb00aadc441c60e1eaf4561f76a2e5 SHA-1: eb039b2b89b651b00ddb67cf63f629a1a156f80f SHA-256: 164178b6342430b7f234db3e4e1d335d97351683cf92920f5975a12c0c8cd846
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm with numerous external URLs, suggesting an attempt to redirect users to potentially malicious sites. The document body, though partially corrupted, indicates a lure related to 'Asp.net interview questions and answers', aligning with phishing or scam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/strik?utm_term=asp.net+interview+questions+and+answers PDF link annotation
    • http://lovewaits.ru/merit_badge_workbook_personal_managementexx4v.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/ic8jiTo/nabegakorebabeperiken.pdfIn PDF document text
    • https://cdn.sqhk.co/lijusute/Cfyhhjf/incremental_plagiarism_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/WoPghs6/sodezilazi.pdfIn PDF document text
    • https://cdn.sqhk.co/xozifejor/5b9ieGG/sound_effects_library_free_download_mp3.pdfIn PDF document text
    • http://4gusevshop.space/1893525045777udk.pdfIn PDF document text
    • http://letgtma.bid/how_to_crochet_a_blanket_for_beginners_step_by_step_slowly8yvtg.pdfIn PDF document text
    • http://microdigitalmeter.xyz/30168279970bsgx2.pdfIn PDF document text
    • https://cdn.sqhk.co/safajoju/1ic7gfj/la_nueva_defensa_fiscal.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/ejg3geh/degaximu.pdfIn PDF document text
    • https://cdn.sqhk.co/gokovolasula/1jdxgcT/download_trenches_of_europe_3_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/menaleratupo/qukhebP/new_york_business_tycoon_download.pdfIn PDF document text
    • http://snapchat-alert.com/the_hunger_games_full_movie_download_in_hindi_720pg4key.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zurovajij/tepuvefitinelel.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/insert_image_google_sheets_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/dd_4e_race_creation.pdfIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_459043474a0246548f5745ef7b82fa9c.pdf?index=trueIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_2f1dc0dcc3a74cda8d2d632a806b54a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fizufapu/critical_theory_today_book.pdfIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_605263e92dca46be87ad95af2c51e130.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadobirak/cloudformation_template_documentation.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/xuzikobox.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/63580369031.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1B 5104 bytes
SHA-256: 8d2c37eae9ddfda2b101a9933df448491b2616f5bd23ebad7148b88807de890a
font_01_sfnt_off00011f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8E 11052 bytes
SHA-256: 046acb906d0cdf7f06326442055f4b26e5890298306a1d09806b46b7172320d2
font_02_sfnt_off0001451d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2